Verification of period in practice is also called the"operation inspection"or"intermediate inspection", refers that in order to keep the confidence of verification or calibration status, laboratory using appropriate techniques as well as the calibration method to carry on multiple inspections for equipment between two regular tests. Object of verification of period is standard, standard substances or other measuring instruments. Its purpose is to ensure whether the measurement standard, standard substances or other measuring instruments maintain the original state.%期间核查在实际工作中也被称作“运行检查”或“中间检查”，是指为了保持检定或校准状态的置信度，实验室自身使用适当的技术以及校准方法对两次定期检定之间的设备进行的多次检查。期间核查的对象是计量标准、标准物质或其他测量仪器。其目的就是为了确保计量标准、标准物质或其他测量仪器是否保持原有状态。
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